Abstract
Background: Frailty is a critical intermediate status of the aging process, characterized by an increased risk of negative health-related events, including physical, cognitive, and psychosocial domains/phenotypes. In particular, the psychosocial domain is heterogeneously defined and little explored. We operationalized a new biopsychosocial frailty (BF) construct, easy to implement in clinical and epidemiological settings. Furthermore, we estimated the impact of this new BF construct on the risk of incident dementia and its subtypes. Methods: Out of 5632 older individuals from the Italian Longitudinal Study on Aging, we identified on 1271 subjects specific characteristics mainly based on a Comprehensive Geriatric Assessment for identifying a construct for a BF by a latent class analysis. We obtained a 11-item instrument derived from three items of the Instrumental Activities of Daily Living, six items of the 30-item Geriatric Depression Scale (GDS-30), the cohabitation status of the individuals, and the physical frailty condition. Reliability and scalability of the items involved were estimated. Criterion-related validity of the new BF construct was calculated assessing the independent contribution of baseline BF to incidence of dementia and its subtypes over 3.5 and 7 years. Findings: Three latent classes were identified, one of them highly aggregating (>40%) physical frailty and the items 3 or 10 of the GDS-30. Over a 3.5-year median follow-up, participants with BF showed an increased risk of overall dementia [hazard ratio (HR) 2.16, 95% confidence interval (CI) 1.07-4.37], particularly vascular dementia (VaD) (HR 3.21, 95% CI 1.05-9.75). Similarly, over 7-year of median follow-up, an increased risk of overall dementia (HR 1.84, 95% CI 1.06-3.20), particularly VaD (HR 2.53, 95% CI 1.08-5.91), was also observed. Interpretation: In a large cohort of Italian older individuals without cognitive impairment at baseline, a BF model was a short- and long-term predictor of overall dementia, particularly VaD. Funding Statement: none declared. Declaration of Interests: None Ethics Approval Statement: The study project was approved by the Institutional Review Board of the 8 municipalities of the ILSA.
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